Question about 2002 GMC Yukon Denali

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My 2002 Yukon Denali alternator wont spin

I replaced the alternator and had the battery charged, the car will start but the alternator won even spin!!! I cant even turn the wheel!! What could it be?

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Make sure you have the serpentine belt routed correctly. Take the belt off and spin each pulley that the belt runs on by hand, to check if all are free spinning and not seized up. Does the alternator spin when the belt is off? Possibly the idler pulley or the tensioner pulley may be seized up or not spinning freely.

Posted on Jan 22, 2013

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Defective alternator , replace and check tensioner , and tensioning of belt .

Posted on Jan 22, 2013

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